# Data Vizualisation - Metrics to measure the quality of a Graphic

This page shows some metrics that can be calculated on a graphic in order to scan their pertinence.

## 3 - List

### 3.1 - Inkt Ratio

$$\text{Data-ink ratio} = \frac{\displaystyle \text{Ink used to describe the data}}{\displaystyle \text{Ink used to describe everything else}}$$

• High is good

### 3.2 - Lie Factor

$$\text{Lie Factor} = \frac{\displaystyle \text{Size of the effect shown on the graphic}}{\displaystyle \text{Size of the effect shown in the data}}$$

Good interval is: $$0.95 < \text{Lie Factor} < 1.05$$

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